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I did, it's in windowed mode. I dislike follscreen anyway and always prefer windowed settings. And resizing won't work because 11764:640 is not a whole number and the screenshots don't have clean, "crisp" pixels. "Telwynium 2" theoretically has the same settings and yet it opens in 640x400, I don't remember how I made it work lke that...

Telwynium has the crt filters so there's no crisp pixels anyway. There are some keyboard shortcuts to change camera filters 'C', and 'M' has some extra settings for people using an actual CRT. Maybe that's what you used for screenshots?

Very possible, I can even vaguely recall probably having used something like that. So what are these shortcuts?

C and M